/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.io;

import proguard.util.ArrayUtil;

import java.io.IOException;

/**
 * This DataEntryReader delegates to a given DataEntryReader, each time stripping a possible prefix from the read data
 * entry name.
 *
 * @author Eric Lafortune
 */
public class PrefixStrippingDataEntryReader implements DataEntryReader {
    private final String prefix;
    private final DataEntryReader dataEntryReader;

    /**
     * Creates a new PrefixStrippingDataEntryReader.
     */
    public PrefixStrippingDataEntryReader(String prefix, DataEntryReader dataEntryReader) {
        this.prefix = prefix;
        this.dataEntryReader = dataEntryReader;
    }

    // Implementation for DataEntryReader.

    public void read(DataEntry dataEntry) throws IOException {
        // Strip the prefix if necessary.
        String name = dataEntry.getName();
        if (name.startsWith(prefix)) {
            dataEntry = new RenamedDataEntry(dataEntry, name.substring(prefix.length()));
        }

        // Read the data entry.
        dataEntryReader.read(dataEntry);
    }
}
